Plug-in device



Aug. 9, 1932. c. WINTER PLUG-IN DEVICE Filed June 18. 1930 INVENTOR CARLWINTER ATTORNEY transformer windings.

Patented Aug. 9, 1932 UNITED STATES PATENT OFFICE CARL WINTER, 0FDBESDEN, GERMANY, ASSIGNOR T0 SIEMENS & HALSKE, AKTIENGE- SELLSCHAFT, OFSIEMENSSTADT, NEAR BERLIN, GERMANY, A CORPORATION OF GERMANY Applicationfiled June 18, 1930, Serial No.

This invention relates broadly to an adjustable power plug-in device andmore specifically to a plug having means for connecting a power sourceto optionally different Many arrangements which must be operated with aconstant operating voltage require that the input terminals thereof beconveniently adapted to be connected to difi'erent line voltages orvoltage variations of the line supply. If the input is through atransformer, the primary winding of the transformer will be providedwith various taps.

The present invention is directed to a plug- 'in connecting devicewhereby the two plugs the present invention in the manner that the p maybe connected in simple manner with the ends of difierent groups ofwindings leading to the plug'.

This is accomplished in accordance with connecting parts for the ends ofthe various circuit elements (windings 'or taps of windings) aredisposed in one part of the plug device and the plugs for the connectionwith the current source in a second part which may be turned, relativeto the first part, for the purpose of the selective change of theconnection. The device is provided with a contact protection-housing onthe order of .a collar plug. The invention will be better understoodfrom a reading of the following specification in conjunction with thedrawing in which,

Figure 1 shows an embodiment of my invention'when the plug is open; and,Figure 2 shows the plug closed. In the drawing, an insulating piece 1has disposed therein the connecting points for the ends of the variouscircuit elements, pro- 0 vided on the one side with soldering clips 6for connecting the windings while ending on the other side in sockets 5.A second insulator piece 2 contains the lugs 4 for providing connectionwith e current source. These plugs traverse the insulator plate and endon the other side likewise in two plugs 3. By means of a screw 8disposed in the insulator part 2 engaging a corresponding) female thread7 in the insulator part 1 0th parts 1 and 2 may be rigidly attached toone another. The connecting points for the difrrnd-rn DEVICE 461,882,and in Germany June 28, 1929.

ferent windingsare arranged in a circle in the manner that each twocorresponding end by to insert the plugs 3 by twisting the parts 1 and 2in the various sockets corresponding to one another. The plug device issurrounded by a housing 10 in order to prevent a con- 'tact of liveparts. The relative position, corresponding to the different voltages,of the two parts 1 and 2 with respect to one another is marked by cuts11 disposed in the collar 10 and by a pin 9 disposed, in part 1. Thevalue of the voltage in-question is marked under the individual cuts. Ifthe device is to be set for another voltage, screw 8 must be loosenedso-far that the lugs 3 may be drawn out o? the sockets 5. 'l he partcarrying the plugs is then twisted with respect to the other art so faruntil the pin 9 is disposed over the cut which belongs to the desiredvoltage. Subsequently the plu s 3 are again inserted in the sockets andheld firmly in this position by the tightening of screw 8. Itis suitableto block the screw 8 in part 1 in such manner that it can be screwed outso far only that a twisting of the two parts with respect to of sets ofterminals carried by sai base, a

set of cooperating contacts on said attaching member, said latter beingadapted to selectively engage with any desired set of said terminals, ahousing for said attaching member and means on said housing cooperatingwith means on said base for indicating an fixing the position of saidattaching member contacts with respect to said terminals.

2. An electrical circuit selector plug-in device comprising, a base andan attaching member, a plurality of sets of terminals carried by saidbase, a set of cooperating contacts on said attaching member, saidlatter beingv adapted to selectively engage any desired set of saidterminals, means for attaching said member to said base comprising aholding device adapted to maintain said base and said attaching memberin fixed relation when said set of cooperating contacts are engaged witha set of said terminals and for maintaining said attaching memberattached to said base while moving said set of terminals from one set ofcontacts to another.

3. An electrical circuit selector plug-in device comprising, a base andan attaching member, a plurality of sets of terminals carried by saidbase, a set of cooperating contacts on said attaching member, saidlatter bein adapted to selectively engage any desired set of terminals,a housing for said attaching member, and means on said housingcooperating with means on said base for indicating and fixing theposition of said attaching member contacts with respect to saidterminals, means for attaching said member to said base, comprising aholding device adapted to maintain said base and said attaching mem herin fixed relation when said set of coo erating contacts are engaged withone 0 said sets of terminals and for maintaining said attaching memberattached to said base but permitting movement between them while movingsaid set of terminals from one set of contacts to another.

- CARL WINTER.

